NASHVILLE, Tenn. (AP) — A special investigative team of the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives is looking into an explosion at a Tennessee ammunition plant that killed one person and injured three others.

The blast Wednesday at the Rio Ammunition plant in McEwen, about 55 miles west of Nashville, killed Rodney Edwards and critically injured Joey Clark, who was being treated at Vanderbilt University Medical Center on Thursday. A woman whom authorities have not yet publicly identified was in stable condition, and another man was discharged.